The Villainess Whom I Had Served For 13 Years Has Fallen

[This novel is a real work. The reason I'm publishing this as a fanfic is because I want more people to be able to read it. I dont own anything Author(s): 수정요정] It's a story about a man who got transported into a novel and possessed a slum boy. He met a noble girl and served her as a butler for 13 Years. Now the girl has already fallen from her noble life and lives in an abandoned mansion with paralyzed legs. Why did she become like that? Of course because she is the villainess in the novel.